JP6491305B1 - Two-stage variable oil pump - Google Patents

Abstract

An object of the present invention is to provide a two-stage variable oil pump capable of adjusting pressure in two stages while having a simple structure.
An outer cam ring (120) rotatably installed with reference to a pivot shaft (PS) provided inside a casing and provided with a rotary chamber RS inside, a spring support portion provided at one end on the outer surface of the outer cam ring , And the other end is in contact with the inner surface of the casing to urge the outer cam ring, and is provided between the outer cam ring and the casing to regulate the degree of eccentricity of the outer cam ring A pumping unit 100 configured to include a chamber 150, and circulation of the oil so that oil discharged from the discharge port is supplied to the regulating chamber or returned to the oil tank. Including a route setting unit 200 for setting a route It is made.
[Selected figure] Figure 2

Description

  The present invention relates to a two-stage variable oil pump, and more particularly, to a two-stage variable oil pump that can adjust pressure in two stages while having a simple structure.

  Generally, in the engine of a vehicle, the engine oil is circulated to prevent overheating of the engine and to reduce the frictional force between various devices. For this purpose, an oil pump is applied.

  However, the oil pump discharges the flow rate to the discharge side and operates to suck the flow rate back to the suction side, so that the driving torque of the engine can only be lost when the oil pump is in operation.

  Since improvement of engine drive torque in a vehicle is an essential item for fuel efficiency improvement, loss of drive torque by the oil pump proportional to the relationship of 'flow rate × hydraulic pressure' of the oil pump (consumption for delivering oil Consumption horsepower) can be reduced by improving the performance of the oil pump.

  Recently, fuel reduction in vehicles has become more important at the time of vehicle development, as fuel efficiency is more important at the time of vehicle development, as global oil price and carbon dioxide regulations further weigh its importance. It is treated as an item.

  In particular, when considering the aspect that improvement of engine driving torque is an essential item for fuel efficiency improvement, reduction of loss of driving torque by the oil pump can be very effective in fuel efficiency improvement.

  For example, as shown in FIG. 1, a structure is disclosed that reduces oil pressure and improves fuel efficiency by bypassing a portion of the oil via a relief valve at high speed RPM.

  However, although the oil pump of the type as described above can eliminate the oil pressure in the high speed section, the oil pressure in the medium speed section is still maintained at a high state, so the efficiency improvement of the fuel efficiency is inferior. There was a point.

Korean Registered Patent No. 10-1509994 (registration date April 1, 2015)

  SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art is to provide a two-stage variable oil pump which can adjust the pressure in two stages while having a simple structure.

  In order to solve the above technical problems, a two-stage variable oil pump according to the present invention comprises an intake port for sucking in oil stored in an oil tank and a discharge port for discharging oil sucked in to the suction port to a main gallery. A casing provided, an outer cam ring rotatably installed with reference to a pivot shaft provided inside the casing, and a rotary chamber provided therein, eccentrically installed with respect to the outer cam ring, and a drive shaft A rotor including a plurality of vanes rotatably coupled in conjunction with the rotation and radially slidably coupled to the outer peripheral surface, one end contacting a spring support portion provided on the outer surface of the outer cam ring, and the other end A support spring which contacts the inner surface of the casing to bias the outer cam ring, the outer cam ring and the support cam A pumping portion, which is provided between the two rollers and includes a regulating chamber for changing the degree of eccentricity of the outer cam ring; and oil discharged from the discharge port is supplied to the regulating chamber Or a path setting unit for setting a circulation path of the oil so as to return to the oil tank.

  Preferably, the pressure of the oil increases in proportion to the RPM of the rotor to less than the first RPM of the rotor, and the pressure of the oil is greater than or equal to the first RPM of the rotor to less than the second RPM. The pressure of the oil rises in proportion to the RPM of the rotor from the second RPM to the third RPM of the rotor, and the pressure of the oil from the third RPM of the rotor to Can be controlled by the controller to maintain the second pressure.

  Preferably, the path setting unit is an inflow port to which oil discharged from the discharge port and circulated through the main gallery flows, an outflow port to supply oil that flows into the inflow port to a subsequent stage, and flows to the inflow port A 3 / 2-way valve for connecting the inflow port and the outflow port or connecting the inflow port and the tank port; and a discharge port from the discharge port. A first port through which the oil flows before circulating through the main gallery, a second port through which the oil introduced into the first port is supplied to the regulating chamber, a third port connected to the outlet port A fourth port connected to the third port, and the first port and the second port Or binding, or spool valve connecting the third and fourth ports; comprise can be configured.

  Preferably, the path setting unit is an inflow port to which oil discharged from the discharge port and circulated through the main gallery flows, an outflow port to supply oil that flows into the inflow port to a subsequent stage, and flows to the inflow port A 3 / 2-way valve for connecting the inflow port and the outflow port or connecting the inflow port and the tank port; and a discharge port from the discharge port. A first port through which oil is circulated after circulating through the main gallery, a second port through which the oil introduced into the first port is supplied to the regulating chamber, and a third port connected to the outlet port A fourth port connected to the third port, and the first port and the second port Or binding, or spool valve connecting the third and fourth ports; comprise can be configured.

  Preferably, the control unit controls the inlet port and the outlet port of the 3 / 2-way valve to be connected to less than the second RPM of the rotor, and the second RPM or more of the rotor to a third RPM. Control the outflow port and the tank port of the 3 / 2-way valve to be connected to less than the RPM of the motor, and the spool valve controls the first port and the second port below the third RPM of the rotor. And the third port and the fourth port are connected, and from the third RPM or more, the first port and the second port are connected, and the third port is connected to the third port. Can be operated to shut off the connection of the fourth port with the second port.

  Preferably, the path setting unit is an inflow port discharged from the discharge port and into which the oil circulated through the main gallery flows, an outflow port supplying the oil flowing into the inflow port to the regulating chamber, and the inflow port A tank port for returning oil introduced into the port to a tank, and connecting the inflow port and the outflow port, or 3 / 2-way valve connecting the inflow port and the tank port; It can be configured.

  Preferably, the control unit controls the inlet port and the outlet port of the 3 / 2-way valve to be connected to less than the second RPM of the rotor, and the second RPM or more of the rotor to a third RPM. Control the outflow port and the tank port of the 3 / 2-way valve to be connected to less than the RPM of the motor, and the inflow port and the outflow port of the 3 / 2-way valve from the third RPM or more of the rotor Can be controlled to

  Preferably, the path setting unit may include a check valve provided between the pumping unit and the main gallery.

  According to the present invention as described above, the pressure of the oil discharged from the oil pump can be adjusted in two stages by the rotational speed (RPM) of the oil pump. It has the advantage of being able to supply.

  Also, by configuring the first port of the spool valve to be connected to the oil line before circulating through the main gallery, it is possible to increase the degree of space utilization within the limited space of the variable oil pump, There is an advantage that the structure can be simplified and the cost can be reduced through this.

  Furthermore, the path setting unit is configured with only the 3 / 2-way valve, and the connection state between the ports of the 3 / 2-way valve is controlled via the control unit, thereby reducing the number of parts. There is an advantage that the cost can be reduced through this.

It is the graph which showed the pressure change by the action | operation of the conventional pump system. FIG. 2 is a configuration diagram showing an operating state of a first section of the two-stage variable oil pump according to the first embodiment of the present invention. FIG. 5 is a configuration diagram showing an operating state of a second section of the two-stage variable oil pump according to the first embodiment of the present invention. It is the block diagram which showed the operating state of the 3rd section of the two-stage variable oil pump by the 1st example of the present invention. It is the block diagram which showed the working condition of the 4th section of the two-stage variable oil pump by the 1st example of the present invention. FIG. 7 is a configuration diagram showing an operating state of a first section of a two-stage variable oil pump according to a second embodiment of the present invention. FIG. 7 is a configuration diagram showing an operating state of a second section of the two-stage variable oil pump according to the second embodiment of the present invention. It is the block diagram which showed the working condition of the 3rd section of the two-stage variable oil pump by a 2nd example of the present invention. It is the block diagram which showed the working condition of the 4th section of the two-stage variable oil pump by a 2nd example of the present invention. FIG. 7 is a configuration diagram showing an operating state of a first section of a two-stage variable oil pump according to a third embodiment of the present invention. FIG. 10 is a configuration diagram showing an operating state of a second section of the two-stage variable oil pump according to the third embodiment of the present invention. FIG. 10 is a configuration diagram showing an operating state of a third section of the two-stage variable oil pump according to the third embodiment of the present invention. FIG. 10 is a configuration diagram showing an operating state of a fourth section of the two-stage variable oil pump according to the third embodiment of the present invention. It is the graph which showed the pressure change in the 1st section thru / or the 4th section of the two-stage variable oil pump by the example of the present invention.

  The present invention can be implemented in other various forms without departing from the technical idea or main features. Accordingly, the embodiments of the present invention are merely illustrative in all respects and should not be construed as limiting.

  Terms such as the first and second can be used to describe various components, but the components are not limited by the terms.

  The above terms are only used to distinguish one component from another component. For example, without departing from the scope of the present invention, the first component may be designated as the second component, and similarly, the second component may also be designated as the first component. It is also good.

  The term "and / or" includes any of a plurality of related listed items or any of a plurality of related listed items.

  Where a component is referred to as being "connected" or "connected" to another component, it may also be directly connected to or connected to that other component. However, it should be understood that other components may exist in the middle.

  On the other hand, when one component is referred to as being "directly linked" or "directly connected" to another component, it must be understood that there is no other component in between. You must.

  The terms used in the present application are merely used to describe particular embodiments, and are not intended to limit the present invention. The singular expression also includes the plural, unless the context clearly indicates otherwise.

  In the present application, the terms "including", "includes", "having", and the like mean that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist. Is not intended to exclude in advance the presence or addition of one or more other features or numbers, steps, operations, components, parts or combinations thereof, etc. It should be understood.

  Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Have.

  Terms as defined in commonly used lexicons should be interpreted as having meanings consistent with those in the context of the relevant art and, unless explicitly defined in the present application, are they ideal? Or is not interpreted in an overly formal sense.

  In the following, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings, but the same or corresponding components are given the same reference numerals regardless of the reference numerals, It shall be omitted.

  When it is determined that the detailed description of the known art related to the description of the present invention may obscure the subject matter of the present invention, the detailed description thereof will be omitted.

First Embodiment
FIG. 2 is a configuration diagram showing the operating state of the first section of the two-stage variable oil pump according to the first embodiment of the present invention, and FIG. 3 is a diagram showing the two-stage variable oil pump according to the first embodiment of the present invention FIG. 4 is a block diagram showing the operating state of the second section, FIG. 4 is a block diagram showing the operating state of the third section of the two-stage variable oil pump according to the first embodiment of the present invention, It is the block diagram which showed the working condition of the 4th section of the two-stage variable oil pump by the 1st example of the present invention.

  The two-stage variable oil pump according to the first embodiment of the present invention includes a pumping unit 100 and a path setting unit 200, as shown in FIGS.

  The pumping unit 100 is a portion where pumping is performed to discharge and send out oil to a main gallery or the like.

  Specifically, the pumping unit 100 includes a casing 110, an outer cam ring 120, a vane 131, a rotor 130, a support spring 140 and the like, and a rotary chamber RS and a regulating chamber 150 are provided therein.

  The casing 110 is provided with a suction port 111 for sucking in oil stored in an oil tank (Tank), and a discharge port 113 for discharging the oil sucked in to the suction port 111 to a main gallery.

  The outer cam ring 120 is rotatably installed about a pivot axis PS provided inside the casing 110, and a rotary chamber RS is provided therein.

  The rotor 130 is installed eccentrically with respect to the outer cam ring 120 and includes a plurality of vanes 131 rotatably coupled with the rotation of the drive shaft and radially slidably coupled to the outer peripheral surface. It consists of

  After the oil in the oil tank is sucked into the rotary chamber RS by the suction force generated at the suction port 111, the vanes 131 rotate in a state where the vanes 131 are radially discharged by the rotation of the rotor 130. The ink is discharged to the discharge port 113.

  One end of the support spring 140 is in contact with a spring support 121 provided on the outer surface of the outer cam ring 120, and the other end of the support spring 140 is in contact with the inner surface of the casing 110. Are configured to bias the outer cam ring 120.

  Therefore, as shown in FIG. 2, when the support spring 140 is in an extended state, the outer cam ring 120 and the rotor 130 become eccentric, and as shown in FIG. 4, the support spring 140 is compressed. In this state, the outer cam ring 120 and the rotor 130 are almost concentric.

  A regulating chamber 150 is provided between the outer cam ring 120 and the casing 110 to change the degree of eccentricity of the outer cam ring 120. The pressure of the regulating chamber 150 causes the support spring 140 to expand and compress.

  The path setting unit 200 is configured to supply the oil discharged from the discharge port 113 provided in the casing 110 of the pumping unit 100 to the regulating chamber 150 or to return it to the oil tank. It is the part which sets up the circulation route of the above-mentioned oil.

  The path setting unit 200 includes a 3 / 2-way valve 210 and a spool valve 220.

  The 3 / 2-way valve 210 is provided with an inflow port P, an outflow port A, and a tank port T, and is a directional control valve having two flow paths.

Specifically, the 3 / 2-way valve 210 supplies the inflow port P to which the oil discharged from the discharge port 113 and circulated through the main gallery flows in, and the oil that flows into the inflow port P to the subsequent stage An outlet port A, a tank port T for returning the oil introduced into the inlet port P to a tank, the inlet port P and the outlet port A are connected, or the outlet port A and the tank port T Two flow paths are provided to connect.

  For example, in the case of the electrically on state, the inflow port P and the outflow port A operate to be connected, and a path through which fluid can flow only through the inflow port P and the outflow port A is provided. In the off state, the inflow port P and the tank port T operate so as to be connected, and a path through which fluid can flow only through the inflow port P and the tank port T is provided.

  The spool valve 220 discharges the oil flowing into the first port P1 into which the oil discharged from the discharge port 113 and flowing through the main gallery before flowing into the regulating chamber 150 flows. A second port P2 to be supplied, a third port P3 connected to the outflow port A, and a fourth port P4 connected to the third port P3 are provided, and the first port P1 The second port P2 is connected, or the third port P3 and the fourth port P4 are connected.

  For example, a first port P1 is provided on an end surface on one side of the spool valve 220, a second port P2 is provided on a side surface on one side of the spool valve 220, and the second port P2 is provided. A third port P3 and a fourth port P4 may be provided at positions separated from each other, and one side of the inside of the spool valve 220 may be the first port P1 and the second port P2. May be provided with a spool for connecting the third port P3 and the fourth port P4, and the other side inside the spool valve 220 may be provided with a spring. .

  Therefore, when the pressure of the oil introduced into the first port P1 is less than a predetermined pressure, the spool is positioned at one side, and the third port P3 and the fourth port P4 are connected. When the pressure of the oil flowing into the first port P1 exceeds a certain pressure, the spool moves to the other side, and the first port P1 and the second port P2 It will be in the state of connecting.

  As described above, the operation of the two-stage variable oil pump including the pumping unit 100 and the path setting unit 200 can be controlled by the control unit (not shown).

  Specifically, the control unit may increase the pressure of the oil to be less than the first RPM of the rotor 130 in proportion to the RPM of the rotor 130, and may control the first RPM or more of the rotor 130 to a second RPM. The pressure of the oil is maintained at the first pressure (P1 in FIG. 14) to less than 90%, and the pressure of the oil is proportional to the RPM of the rotor 130 from the second RPM to the third RPM of the rotor 130. The pumping unit 100 and the route setting unit 200 can be controlled so that the pressure of the oil maintains the second pressure (P2 in FIG. 14) from the third RPM or more of the rotor 130.

  To this end, the control unit controls the inlet port P and the outlet port A of the 3 / 2-way valve 210 to be connected to less than the second RPM of the rotor 130, and The outlet port A and the tank port T of the 3 / 2-way valve 210 are controlled so as to be connected from the RPM of the second to the third of the RPM.

  Further, the spool valve 220 cuts off the connection between the first port P1 and the second port P2 below the third RPM of the rotor 130, and connects the third port P3 and the fourth port P4. From the third RPM or higher to operate to connect the first port P1 and the second port P2 and to disconnect the connection between the third port P3 and the fourth port P4. .

  The control process of the control unit as described above and the operating state of the spool valve 220 are considered for each section as follows.

  First, when the RPM of the rotor 130 is less than 0 and less than the first RPM (point A in FIG. 14), the control unit controls the inlet port P and the outlet port A of the 3 / 2-way valve 210. The spool valve 220 is operated to block the connection between the first port P1 and the second port P2 and to connect the third port P3 and the fourth port P4. You will come to

  Therefore, as shown in FIG. 2, the oil sucked into the suction port 111 is compressed by the rotary chamber RS and discharged to the discharge port 113, and the oil discharged from the discharge port 113 is the oil filter and the main gallery. , And can be supplied to the regulating chamber 150 through the third port P3 and the fourth port P4 of the spool valve 220 through the inlet port P and the outlet port A of the 3 / 2-way valve 210. Become.

  In such a state, as shown in FIG. 14, the pressure of the oil rises in proportion to the RPM of the rotor 130 until the pressure of the rotary chamber RS becomes P1.

  Then, even when the RPM of the rotor 130 is greater than or equal to the first RPM and less than the second RPM (point B in FIG. 14), the control unit controls the inlet port P of the 3 / 2-way valve 210 and The outlet port A is controlled to be connected, and the spool valve 220 cuts off the connection between the first port P1 and the second port P2, and the third port P3 and the fourth port P4 are connected. Work to

  At this time, as the pressure of the oil acting on the regulating chamber 150 is increased, the support spring 140 is compressed and the rotor 130 and the outer cam ring 120 become nearly concentric, so that the oil is not compressed. The pressure of the oil does not rise and maintains the first pressure (P1 in FIG. 14).

  That is, as shown in FIG. 3, the oil sucked into the suction port 111 is discharged to the discharge port 113 through the rotary chamber RS, and the oil discharged from the discharge port 113 circulates through the oil filter and the main gallery. After being supplied to the regulating chamber 150 through the third port P3 and the fourth port P4 of the spool valve 220 through the inflow port P and the outflow port A of the 3 / 2-way valve 210. is there.

  Under such conditions, the overall oil pressure will maintain the first pressure (P1 in FIG. 14).

  Then, if the RPM of the rotor 130 is greater than or equal to the second RPM and less than the third RPM (point C in FIG. 14), the control unit controls the outlet port A of the 3 / 2-way valve 210 and The tank port T is controlled to be connected, and the spool valve 220 cuts off the connection between the first port P1 and the second port P2, and the third port P3 and the fourth port P4 are connected. Work to

  That is, while the oil in the regulating chamber 150 is returned to the tank through the third port P3 and the fourth port P4 of the spool valve 220, the oil pressure in the regulating chamber 150 is lowered, thereby the rotor 130 and the outer The cam ring 120 is again in the eccentric state.

  Therefore, as shown in FIG. 4, the oil sucked into the suction port 111 is compressed by the rotary chamber RS and discharged to the discharge port 113, and the oil discharged from the discharge port 113 is the oil filter and the main You will be able to circulate the gallery.

  In such a state, as shown in FIG. 14, the pressure of the oil is increased in proportion to the RPM of the rotor 130 until the pressure of the rotary chamber RS reaches the second pressure.

  Then, when the RPM of the rotor 130 is equal to or higher than the third RPM, the first port P1 and the second port P2 of the spool valve 220 are connected, and the third port P3 and the fourth port P4 are connected. Act to shut off the connection of

  At this time, as the pressure of the oil acting on the regulating chamber 150 is increased, the support spring 140 is compressed and the rotor 130 and the outer cam ring 120 become nearly concentric, so that the oil is not compressed. The pressure of the oil does not rise, and the second pressure (P2 in FIG. 14) is maintained.

  That is, as shown in FIG. 5, the oil sucked into the suction port 111 is discharged to the discharge port 113 through the rotary chamber RS, and the oil discharged from the discharge port 113 circulates through the oil filter and the main gallery. Do. In addition, a part of the oil discharged from the discharge port 113 flows into the first port P1 of the spool valve 220 through the first separation line L1, and then is discharged through the second port P2, and the regulating chamber It is in the state of being supplied to 150.

  Under such conditions, the overall oil pressure will maintain the second pressure (P2 in FIG. 14).

Second Embodiment
FIG. 6 is a configuration diagram showing an operating state of a first section of a two-stage variable oil pump according to a second embodiment of the present invention, and FIG. 7 is a diagram showing a two-stage variable oil pump according to the second embodiment of the present invention FIG. 8 is a block diagram showing the operating state of the second section, FIG. 8 is a block diagram showing the operating state of the third section of the two-stage variable oil pump according to the second embodiment of the present invention, It is the block diagram which showed the working condition of the 4th section of the two-stage variable oil pump by a 2nd example of the present invention.

  The two-stage variable oil pump according to the second embodiment of the present invention includes a pumping unit 100 and a path setting unit 200 as shown in FIGS. 6 to 9.

  The pumping unit 100 is a portion where pumping is performed in order to discharge and deliver the oil to the main gallery or the like, and is the same as the pumping unit 100 of the first embodiment, so a detailed description will be omitted.

  The path setting unit 200 includes a 3 / 2-way valve 210 and a spool valve 220. The configuration of each of them is the same as that of the 3 / 2-way valve 210 and the spool valve 220 of the first embodiment. Only the connection relationship of the ports of the spool valve 220 is different.

  Specifically, the spool valve 220 is a first port P1 through which oil discharged from the discharge port 113 and circulated through the main gallery flows in through the second separation line L2, and the first port P1. A second port P2 for supplying the oil introduced into the control chamber 150, a third port P3 connected to the outlet port A, and a fourth port P4 connected to the third port P3 The first port P1 is connected to the second port P2, or the third port P3 is connected to the fourth port P4.

  As described above, the operation of the two-stage variable oil pump including the pumping unit 100 and the path setting unit 200 can be controlled by the control unit.

  Specifically, the control unit may increase the pressure of the oil to be less than the first RPM of the rotor 130 in proportion to the RPM of the rotor 130, and may control the first RPM or more of the rotor 130 to a second RPM. The pressure of the oil is maintained at the first pressure (P1 in FIG. 14) to less than 90%, and the pressure of the oil is proportional to the RPM of the rotor 130 from the second RPM to the third RPM of the rotor 130. The pumping unit 100 and the route setting unit 200 can be controlled so that the pressure of the oil maintains the second pressure (P2 in FIG. 14) from the third RPM or more of the rotor 130.

  To this end, the control unit controls the inlet port P and the outlet port A of the 3 / 2-way valve 210 to be connected to less than the second RPM of the rotor 130, and The outlet port A and the tank port T of the 3 / 2-way valve 210 are controlled so as to be connected from the RPM of the second to the third of the RPM.

  Further, the spool valve 220 cuts off the connection between the first port P1 and the second port P2 below the third RPM of the rotor 130, and connects the third port P3 and the fourth port P4. From the third RPM or higher to operate to connect the first port P1 and the second port P2 and to disconnect the connection between the third port P3 and the fourth port P4. .

  The control process of the control unit and the operation state of the spool valve 220 as described above are the same or similar to those of the first embodiment, and thus the detailed description will be omitted.

Third Embodiment
FIG. 10 is a configuration diagram showing an operating state of a first section of a two-stage variable oil pump according to a third embodiment of the present invention, and FIG. 11 is a diagram showing a two-stage variable oil pump according to the third embodiment of the present invention FIG. 12 is a block diagram showing the operating state of the second section, FIG. 12 is a block diagram showing the operating state of the third section of the two-stage variable oil pump according to the third embodiment of the present invention; FIG. 10 is a configuration diagram showing an operating state of a fourth section of the two-stage variable oil pump according to the third embodiment of the present invention.

  The two-stage variable oil pump according to the third embodiment of the present invention includes a pumping unit 100 and a path setting unit 200 as shown in FIGS. 10 to 13.

  The pumping unit 100 is a portion where pumping is performed in order to discharge and deliver the oil to the main gallery or the like, and is the same as the pumping unit 100 of the first embodiment, so a detailed description will be omitted.

  The path setting unit 200 sets the oil circulation path so that the oil discharged from the discharge port 113 may be supplied to the regulating chamber 150 or may be returned to the oil tank. 3 / 2-way valve 210, and a check valve 230 provided between the pumping unit 100 and the main gallery.

The 3 / 2-way valve 210 is an inflow port P into which the oil discharged from the discharge port 113 and circulated through the main gallery flows, and an outflow that supplies the oil flowing into the inflow port P to the regulating chamber 150 A port A is provided with a tank port T for returning the oil introduced into the inflow port P to a tank, and the inflow port P and the outflow port A are connected or the outflow port A and the tank port T are connected. Are provided to connect the two.

  As described above, the operation of the two-stage variable oil pump including the pumping unit 100 and the path setting unit 200 can be controlled by the control unit.

  Specifically, the control unit may increase the pressure of the oil to be less than the first RPM of the rotor 130 in proportion to the RPM of the rotor 130, and may control the first RPM or more of the rotor 130 to a second RPM. The pressure of the oil maintains the pressure P1 of the first pressure diagram 14 below, and the pressure of the oil rises in proportion to the RPM of the rotor 130 from the second RPM to the third RPM of the rotor 130. The pumping unit 100 and the path setting unit 200 can be controlled such that the pressure of the oil maintains the second pressure (P2 in FIG. 14) from the third RPM or more of the rotor 130.

  To this end, the control unit controls the inlet port P and the outlet port A of the 3 / 2-way valve 210 to be connected to less than the second RPM of the rotor 130, and Control so that the outlet port A of the 3 / 2-way valve 210 and the tank port T are connected from the RPM of the motor 130 to the RPM of the motor 3 of the second to above 3rd RPM of the rotor 130; The inflow port P and the outflow port A of the way valve 210 are controlled to be connected.

  The control process of the control unit as described above is examined for each section as follows.

  First, when the RPM of the rotor 130 is from 0 to less than the first RPM (point A in FIG. 14), the control unit controls the inflow port P and the outflow port A of the 3 / 2-way valve 210. Control to be connected.

  Therefore, as shown in FIG. 10, the oil sucked into the suction port 111 is compressed by the rotary chamber RS and discharged from the discharge port 113, and the oil discharged from the discharge port 113 is the oil filter and the main After circulating through the gallery, it can be supplied to the regulating chamber 150 through the inlet port P and the outlet port A of the 3 / 2-way valve 210.

  In such a state, as shown in FIG. 14, the pressure of the oil rises in proportion to the RPM of the rotor 130 until the pressure of the rotary chamber RS reaches P1.

Then, even when the RPM of the rotor 130 is greater than or equal to the first RPM and less than the second RPM (point B in FIG. 14), the control unit controls the inflow port P of the 3 / 2-way valve 210 and the outflow. Control that port A is connected.
At this time, as the pressure of the oil acting on the regulating chamber 150 is increased, the support spring 140 is compressed and the rotor 130 and the outer cam ring 120 become nearly concentric, and the oil is not compressed. The pressure of the oil does not rise and maintains the first pressure (P1 in FIG. 14).

  That is, as shown in FIG. 11, the oil sucked into the suction port 111 is discharged to the discharge port 113 through the rotary chamber RS, and the oil discharged from the discharge port 113 circulates through the oil filter and the main gallery. After that, the pressure is supplied to the regulating chamber 150 through the inflow port P and the outflow port A of the 3 / 2-way valve 210, and the pressure of the oil is maintained at the first pressure. Become.

  Then, if the RPM of the rotor 130 is greater than or equal to the second RPM and less than the third RPM (point C in FIG. 14), the control unit controls the outlet port A of the 3 / 2-way valve 210 and the tank. The port T is controlled to be connected.

  That is, while the oil of the regulating chamber 150 is returned to the tank through the outlet port A of the 3 / 2-way valve 210 and the tank port T, the oil pressure of the regulating chamber 150 is lowered, and The outer cam ring 120 is again in the eccentric state.

  Therefore, as shown in FIG. 12, the oil sucked into the suction port 111 is compressed by the rotary chamber RS and discharged to the discharge port 113, and the oil discharged from the discharge port 113 is the oil filter and the main You will be able to circulate the gallery.

  In such a state, as shown in FIG. 14, the pressure of the oil is increased in proportion to the RPM of the rotor 130 until the pressure of the rotary chamber RS reaches the second pressure.

  Then, when the RPM of the rotor 130 is equal to or higher than the third RPM, the inflow port P and the outflow port A of the 3 / 2-way valve 210 are controlled to be connected.

  At this time, as the pressure of the oil acting on the regulating chamber 150 is increased, the support spring 140 is compressed and the rotor 130 and the outer cam ring 120 become nearly concentric, so that the oil is not compressed. The pressure of the oil does not rise, and the second pressure (P2 in FIG. 14) is maintained.

  That is, as shown in FIG. 13, the oil sucked into the suction port 111 is discharged to the discharge port 113 through the rotary chamber RS, and the oil discharged from the discharge port 113 circulates through the oil filter and the main gallery. Do. In addition, a part of the oil discharged from the discharge port 113 flows into the first port P1 of the spool valve 220 through the first separation line L1, and then is discharged through the second port P2, and the regulating chamber It is in the state of being supplied to 150.

  Under such conditions, the overall oil pressure will maintain the second pressure.

  On the other hand, the check valve 230 provided between the pumping unit 100 and the main gallery is a part for preventing an excessive pressure rise of oil due to an electrical malfunction of the 3 / 2-way valve 210. The function is to prevent the pressure of the oil circulating in the main gallery from rising above a certain level even if the 3 / 2-way valve 210 does not operate normally.

  While the present invention has been described focusing on the preferred embodiments with reference to the accompanying drawings, many variations and obvious variations will occur to those skilled in the art without departing from the scope of the present invention from such a description. It is obvious that is possible. Therefore, the scope of the present invention should be interpreted by the claims described so as to include such many modifications.

100: Pumping part 110: Casing 111: Suction port 113: Discharge port 120: Outer cam ring 121: Spring support part 130: Rotor 131: Vane 140: Support spring 150: Regulating chamber 200: Path setting part 210: 3 / 2- way valve 220: spool valve 230: check valve P: inflow port A: outflow port T: tank port P1: first port P2: second port P3: third port P4: fourth port PS: pivot axis RS: Rotary chamber

Claims (2)

A casing provided with a suction port for sucking in oil stored in an oil tank, and a discharge port for discharging the oil sucked into the suction port to the main gallery, which can be rotated on the basis of a pivot shaft provided inside the casing , An outer cam ring provided with a rotary chamber inside, and installed so as to be eccentric to the outer cam ring, rotates in conjunction with the rotation of the drive shaft, and can slide radially on the outer peripheral surface A rotor including a plurality of coupled vanes, one end of which is in contact with a spring support provided on the outer surface of the outer cam ring, and the other end of which is in contact with the inner surface of the casing to bias the outer cam ring. Provided between the outer cam ring and the casing, and changing the degree of eccentricity of the outer cam ring A pumping unit including a regulating chamber; and oil circulated from the discharge port so as to be supplied to the regulating chamber or returned to the oil tank. route setting unit that sets a route; only including,
The pressure of the oil rises in proportion to the RPM of the rotor to less than the first RPM of the rotor, and the pressure of the oil is greater than the first RPM of the rotor to less than the second RPM. The pressure of the oil increases in proportion to the RPM of the rotor from the second RPM to the third RPM of the rotor, and the pressure of the oil from the third RPM of the rotor to the second Controlled by the controller to maintain the pressure of the
The route setting unit is
An inflow port into which oil discharged from the discharge port and circulated through the main gallery flows, an outflow port which supplies the oil flowing into the inflow port to a subsequent stage, and a tank which returns the oil flowing into the inflow port to a tank A 3 / 2-way valve provided with a port to connect the inflow port and the outflow port or to connect the outflow port and the tank port;
A first port to which oil discharged from the discharge port and circulated through the main gallery is introduced, a second port to supply the oil introduced to the first port to the regulating chamber, and the outflow port A third port connected to the second port, and a fourth port connected to the third port, and connecting the first port and the second port, or the third port and the fourth port A spool valve connecting the ports of
Two-stage variable oil pump characterized by The control unit
The inlet port and the outlet port of the 3 / 2-way valve are controlled to be connected to less than the second RPM of the rotor, and the 3/2 or more to the third RPM of the rotor are controlled. -Control so that the outlet port of the way valve and the tank port are connected,
The spool valve is
When the rotor is less than the third RPM, the connection between the first port and the second port is cut off, and the third port and the fourth port are operated to connect, and from the third RPM or more together with first and second ports are connected, the third port and the two-stage variable oil according to claim 1, characterized in that operate to cut off the connection of the fourth port pump.

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